Sleep Supplements
Better sleep starts with the basics. Supplements can support the routine.
Sleep affects memory, mood, immune function, recovery, and how we feel throughout the day. For most adults, roughly 7–9 hours of good-quality sleep is a reasonable target.
Supplements can help, but they work best alongside the things that have the biggest impact: a consistent schedule, appropriate light exposure, a comfortable sleep environment, and good sleep habits.
For persistent insomnia, cognitive behavioral therapy for insomnia—or CBT-I—remains one of the most effective approaches.
The goal is not to build an elaborate bedtime supplement routine. It is to identify a few options that make sense for your situation and use them thoughtfully.
Start With the Sleep Foundation
Before adding supplements, make sure the basics are working in your favor.
Keep a consistent schedule
Going to bed and waking at roughly the same time each day helps reinforce your natural sleep-wake rhythm—even on weekends.
Use light intentionally
Bright light in the morning helps tell your brain that the day has started. In the evening, dimming lights and reducing bright screens can make the transition toward sleep easier.
Watch caffeine and alcohol
Caffeine later in the day can interfere with sleep even when you can still fall asleep normally.
Alcohol may make you sleepy initially but can disrupt sleep later in the night and reduce overall sleep quality.
Make the bedroom work for sleep
A cool, dark, quiet environment generally supports better sleep.
If you cannot fall asleep after about 20 minutes, getting up briefly and doing something calm can be more useful than lying awake frustrated.
Supplements With the Best Evidence
These are the options with the strongest or most consistent support for sleep.
Magnesium
What it may help with: Magnesium may support sleep quality and relaxation, particularly in people who are not getting enough magnesium or in some older adults.
How I think about it: Magnesium is one of the more practical places to start because it may support sleep while also serving several other normal functions throughout the body.
Magnesium glycinate is commonly used in an evening routine because it tends to be well tolerated.
Good to know: Higher amounts of magnesium can cause loose stools or stomach upset. The research has used a variety of doses and forms, so more is not automatically better.
Melatonin
What it may help with: Melatonin can modestly shorten the time it takes to fall asleep and may slightly improve sleep quality or total sleep time.
Where it makes the most sense: Melatonin is most useful when the problem involves sleep timing rather than simply needing a stronger sleep aid. Good examples include jet lag or travel across time zones, adjusting to a new shift-work schedule, or temporarily helping establish a new sleep-wake routine.
Good to know: Lower doses can work just as well as larger ones. More is not necessarily better, and higher doses are more likely to cause morning grogginess, headaches, or vivid dreams.
A reasonable perspective: Personally and professionally, I rarely recommend melatonin as a routine nightly sleep supplement. I think of it primarily as a short-term tool for resetting or adjusting the body clock—for example, during jet lag, travel to a new time zone, a new shift-work pattern, or while establishing a new sleep schedule.
Once the new routine is established, I generally prefer to remove the melatonin rather than continue it indefinitely. Short-term use appears reasonably safe for most adults, but we have much less certainty about taking melatonin every night for months or years.
Recent research has also raised a possible cardiovascular safety signal with prolonged use, including associations with heart failure and hospitalization. That does not prove melatonin causes heart problems, but it adds another reason not to treat long-term nightly use casually.
Extra caution with children: I am even more conservative with melatonin in children. Long-term safety data is limited, and because melatonin is a hormone involved in the sleep-wake cycle, there are still unanswered questions about prolonged use during development. Accidental ingestions in young children have also led to thousands of emergency-department visits.
When melatonin is used in a child, there should be a clear reason, a specific goal, and a plan for how long it will be used rather than become a permanent bedtime routine.
L-Theanine
What it may help with: L-theanine is an amino acid naturally found in tea that may promote a calmer mental state and support sleep quality.
How I think about it: This may be a useful option when difficulty winding down is part of the problem. It tends to make more sense as a relaxation-support ingredient than as a traditional sedative. The evidence is promising, although not as extensive as the research behind melatonin.
Glycine
What it may help with: Glycine taken before bed may help improve how rested someone feels after sleeping.
How I think about it: It is a relatively simple option that may fit well into a streamlined evening routine, particularly when the goal is better perceived sleep quality rather than simply becoming sleepy faster.
L-Tryptophan
What it may help with: L-tryptophan is an amino acid involved in pathways that ultimately contribute to serotonin and melatonin production. Research suggests that around 1 gram per day may reduce the amount of time spent awake during the night in some people.
How I think about it: It is another reasonable option, but generally not the first supplement I would reach for when simpler approaches are working.
Other Options With Supporting Evidence
The research behind these is less consistent, but they can still be reasonable choices depending on the person and the goal.
Valerian Root
Valerian is one of the most widely studied herbs for sleep. Research results are mixed, but some people report improvement in sleep quality or falling asleep.
Lemon Balm
Lemon balm (Melissa officinalis) may support relaxation and make it easier to settle down at bedtime.
Saffron
Small studies suggest saffron may modestly improve sleep quality. It is also being studied for several aspects of mood and emotional wellness.
Tart Cherry
Tart cherry juice and extracts naturally contain compounds involved in sleep regulation and may modestly improve insomnia symptoms in some people.
Other Options
There is also emerging or less-established research involving ashwagandha, omega-3 fatty acids, kiwifruit, and vitamin D. These may make sense in certain situations, but they generally are not where I would start solely for sleep.
A Reasonable Approach to Sleep Supplements
Sleep supplements do not need to become a nightly handful of capsules.
Start with the foundation.
Your schedule, light exposure, caffeine habits, sleep environment, and overall routine usually matter more than any individual supplement.
Match the supplement to the problem.
Someone struggling to relax may need a different approach than someone dealing with jet lag, a disrupted schedule, or waking repeatedly during the night.
Start simple.
One well-chosen supplement is often more useful than starting several ingredients at once.
Give it a fair trial.
Unless a product clearly causes a problem, give yourself enough time to decide whether it is actually helping.
Pay attention to how you feel the next morning.
A supplement that makes you sleep but leaves you groggy for half the following day is probably not improving the bigger picture.
When Sleep Problems Deserve a Closer Look
Supplements are useful tools, but they are not the answer to every sleep problem.
Persistent insomnia, significant daytime sleepiness, or sleep problems accompanied by loud snoring, gasping, choking, or pauses in breathing deserve further evaluation.
These symptoms can point to an underlying sleep disorder rather than a supplement deficiency.
For ongoing insomnia, CBT-I is worth taking seriously rather than continually adding stronger sleep products.
Better sleep usually starts with better habits. Supplements should support the routine—not replace it.
PHARMACIST-SELECTED OPTIONS
Ready to put this into practice?
Browse the supplements I selected for this collection based on evidence, quality, practicality, and overall value.
Health & Reason may earn revenue from purchases made through its Fullscript dispensary. That relationship does not determine what is recommended.
Educational information is not a substitute for individualized medical advice. Talk with your healthcare professional about your personal health questions and before starting or stopping a medication or supplement.
Reviewed and edited by Kyle Smith, PharmD, MBA
Related topics: Magnesium · Stress & Calm